Circular No. 66, U. S. Dept. of Agriculture 



Plate 8 



A.— A tuna market at San Luis Potosi, Mexico, 1905. B .— A bud variation in one of the spineless 

 Sicilian varieties of Opuntia grown at the United States Plant Introduction Garden at Chico, 

 Calif., 1911. The spiny portion bears a very suggestive resemblance to Opuntia amyclaea 



